Disk Space Monitor empty reports

Disk Space Monitor does not show any information in the reports sent and when I try to generate detailed reports of the listed servers I get these messages:
The following errors occurred during the report generation:
Server \\servername: Failed to connect to server or shared folder . The requested name is valid, but no data of the requested type was found
Server \\servername: Failed to connect to server or shared folder . The requested name is valid, but no data of the requested type was found
How can I solve this problem please?